At this page you find some selected links ordered by topic,
where we have laid emphasis on interactive learning material
which needs no download or additional software, although some
spreadsheets (requiring Microsoft Excel to run on your computer)
and other media have been included.

For a refined search on this page use your browser's search functionality
(Menu Edit®Find in Page or the
key combination Ctrl F)!

Graphing Linear Equations
(applet) Learning program on linear functions and their graphical representation
as straight lines in a plane. Includes tutorial, test, quiz, crossword puzzle
and - as tools - the possibility to plot graphs of functions and a calculator.
You may pose questions to the teachers and discuss with pupils of the
Bremen High School, USA.

Graph Applet (applet) A straight line may interactively be moved, the
coefficients m and b of its equation are shown.

Trigonometry (some applets)
A number of units to illustrate definitions, graphs and simple properties
of the trigonometric functions, including the
Sum Formulae, the Law of Sines and the Law of Cosines.
In particular see two applets about the graphs of the
Sine and the
Cosine function
and a further applet by which the definitions of the
various trigonometric functions may be compared.

Curves

Famous Curves (graphics and applets)
More than sixty famous plane curves or families of curves
are discussed and represented graphically.
In the applet versions their parameters may be changed interactively.
See also the
Famous Curves Applet Index. (School of Mathematical and Computational Sciences,
University of St Andrews, Scotland).

The School of the Web
by M. Casco provides rich material and online animations on chaos theory and fractals.

Ulli's Fractal Home
is a rich site offering material on fractals (interactive applets, graphics, texts and download).

Fourier analysis

Realtime
Fourier sound synthesis (spreadsheet) Sound generator:
Determine the intensities of overtones by means of a scroll bar and listen to the according sound.
(Even without sound utility, the graphical side of this spreadsheet is a nice
illustration of the Fourier series).